prefix

n. 1 verbal element placed at the beginning of a word to qualify its meaning (e.g. Ex-, non-). 2 title before a name (e.g. Mr). v. (often foll. By to) 1 add as an introduction. 2 join (a word or element) as a prefix.

v. t. To put or fix before, or at the beginning of, another thing; as, to prefix a syllable to a word, or a condition to an agreement.